fix: quorum calculation mistake with reduced parity (#10186)

With reduced parity our write quorum should be same
as read quorum, but code was still assuming

```
readQuorum+1
```

In all situations which is not necessary.

cmd/erasure-multipart.go

@@ -367,7 +367,7 @@ func (er erasureObjects) PutObjectPart(ctx context.Context, bucket, object, uplo
 		writers[i] = newBitrotWriter(disk, minioMetaTmpBucket, tmpPartPath, erasure.ShardFileSize(data.Size()), DefaultBitrotAlgorithm, erasure.ShardSize())
 	}
 
-	n, err := erasure.Encode(ctx, data, writers, buffer, fi.Erasure.DataBlocks+1)
+	n, err := erasure.Encode(ctx, data, writers, buffer, writeQuorum)
 	closeBitrotWriters(writers)
 	if err != nil {
 		return pi, toObjectErr(err, bucket, object)